() 5. Too much water in our school every day. It's a serious problem.

   A. has wasted   B. have wasted   C. was wasting   D. is wasted

() 4. We should try to all our waste paper.

   A. recycle   B. protect   C. produce   D. reduce

() 3. Many accidents by careless drivers last year.

   A. are caused   B. were caused   C. have caused   D. will cause

() 2. those lights,please. Don’t use so much energy.

   A. Take off   B. Put on   C. Turn on   D. Turn off

二、单项填空

() 1. The computers in the classroom next month.

   A. is going to use   B. will be used   C. use   D. have used

7. The teacher says we can (回收利用) waste to protect our environment.

6. The costs were (减少) by 20% last year and it was a great success.

5. My Taiwan friends plant some trees (面包树) in their gardens.

4. It really looked funny when my classmates were trying to (挖) me out because I was covered in the snow.

3. Can you be (严肃) for once? This is important for everyone.